2005
- Agricultural History – Presented to James Watson of Massey University, New Zealand, for his scholarly study, "The Significance of Mr. Richard Buckley's Exploding Trousers".
- Biology – Presented jointly to Benjamin Smith of the University of Adelaide, Australia and the University of Toronto, Canada and the Firmenich perfume company, Geneva, Switzerland, and ChemComm Enterprises, Archamps, France; Craig Williams of James Cook University and the University of South Australia; Michael Tyler of the University of Adelaide; Brian Williams of the University of Adelaide; and Yoji Hayasaka of the Australian Wine Research Institute; for painstakingly smelling and cataloging the peculiar odors produced by 131 different species of frogs when the frogs were feeling stressed.
- Chemistry – Presented jointly to Edward Cussler of the University of Minnesota and Brian Gettelfinger of the University of Minnesota and the University of Wisconsin–Madison, for conducting a careful experiment to settle the longstanding scientific question: can people swim faster in syrup or in water? It was found that swimmers in the experiment reach comparable velocity in both media.
- Economics – Presented to Gauri Nanda of the Massachusetts Institute of Technology, for inventing Clocky, an alarm clock that runs away and hides, repeatedly, thus ensuring that people get out of bed, and thus theoretically adding many productive hours to the workday.
- Fluid Dynamics – Presented jointly to Victor Benno Meyer-Rochow of International University Bremen, Germany and the University of Oulu, Finland; and József Gál of Loránd Eötvös University, Hungary, for using basic principles of physics to calculate the pressure that builds up inside a penguin, as detailed in their report "Pressures Produced When Penguins Poo—Calculations on Avian Defecation".
- Literature – Presented to the Internet entrepreneurs of Nigeria, for creating and then using e-mail to distribute a bold series of short stories, thus introducing millions of readers to a cast of rich characters—General Sani Abacha, Mrs. Mariam Sanni Abacha, Barrister Jon A Mbeki Esq., and others—each of whom requires just a small amount of expense money so as to obtain access to the great wealth to which they are entitled and which they would like to share with the kind person who assists them. (See advance fee fraud.)
- Medicine – Presented to Gregg A. Miller of Oak Grove, Missouri, for inventing Neuticles—artificial replacement testicles for dogs, which are available in three sizes, and three degrees of firmness.
- Nutrition – Presented to Dr. Yoshiro Nakamatsu of Tokyo, Japan, for photographing and retrospectively analyzing every meal he has consumed during a period of 34 years (and counting).
- Peace – Presented jointly to Claire Rind and Peter Simmons of University of Newcastle, in the UK, for electrically monitoring the activity of a brain cell in a locust while that locust was watching selected highlights from the movie Star Wars.
- Physics – Presented jointly to John Mainstone and Thomas Parnell of the University of Queensland, Australia, for patiently conducting the so-called pitch drop experiment that began in the year 1927—in which a glob of congealed black tar pitch has been slowly dripping through a funnel, at a rate of approximately one drop every nine years.
Read more about this topic: List Of Ig Nobel Prize Winners